Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium? 76 114 190 266

The number of neutrons in osmium is 114.

Explanation:

Atomic number is defined as the number of protons that are present in an atom. It is represented as 'Z'

Atomic number = Number of protons

Mass number is defined as the sum of number of protons and number of neutrons that are present in an atom. It is represented as 'A'

Mass number = Number of neutrons + Number of protons

We know that:

Atomic number of osmium = 76

Mass number of osmium = 190

Number of neutrons = 190 - 76 = 114

Hence, the number of neutrons in osmium is 114.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2